in.rexecd(1M)

NAME

in.rexecd, rexecd– Remote execution server

SYNOPSIS

in.rexecd

DESCRIPTION

in.rexecd is the server for the rexec(3SOCKET) routine. The server
provides remote execution facilities with authentication based on user names
and passwords. It is invoked automatically as needed by inetd(1M),
and then executes the following protocol:

1)

The server reads characters from the socket up to a null (\\0) byte. The resultant string is interpreted as an ASCII number, base 10.

2)

If the number received in step
1 is non-zero, it is interpreted as the port number of a secondary stream
to be used for the stderr. A second connection is then
created to the specified port on the client's machine.

3)

A null terminated user name
of at most 16 characters is retrieved on the initial socket.

4)

A null terminated password
of at most 16 characters is retrieved on the initial socket.

5)

A null terminated command to
be passed to a shell is retrieved on the initial socket. The length of the
command is limited by the upper bound on the size of the system's argument
list.

6)

rexecd then
validates the user as is done at login time and, if the authentication was
successful, changes to the user's home directory, and establishes the user
and group protections of the user. Access is denied unless the
user has the remote login authorization. If the /etc/nologin
file exists, access is denied. If any of these steps fail the connection
is aborted and a diagnostic message is returned.

7)

A null byte is returned on
the connection associated with the stderr and the command
line is passed to the normal login shell of the user. The shell inherits
the network connections established by rexecd.

SEE ALSO

Trusted Solaris 8 HW 12/02 Reference Manual

SunOS 5.8 Reference Manual

DIAGNOSTICS

All diagnostic messages are returned on the connection associated
with the stderr, after which any network connections
are closed. An error is indicated by a leading byte with a value of 1 (0
is returned in step 7 above upon successful completion of all the steps
prior to the command execution).

username
too long

The name is longer than 16 characters.

password too long

The password is longer than 16 characters.

command too long

The command line passed exceeds the size of the argument list (as
configured into the system).